Ingredients
50g shelled walnuts, roughly chopped
50g raisins or sultanas, or 1 handful grapes (optional)
2 sharp green apples (eg, granny smiths)
1 lemon
2-3 celery sticks, or fewer, depending on taste
2 tbsp natural yoghurt, or creme fraiche (optional)
100g mayonnaise, preferably not made with olive oil
1 tsp dijon mustard, or to taste (optional)
Salt and black pepper
1 little gem lettuce, to serve (optional)
Walnut oil, to serve (optional)